Discussion on TQ2984

Robin & Janis Hall ask why there are blue lights under this canal bridge:
TQ2984 : Camden Street Bridge over Regent's Canal.I don't know, but I would guess it's an attempt to deter drug abuse. Apparently it's more difficult to find a vein under a blue light - which is why blue lights are often used in public toilets. Sad reality of urban life, I'm afraid.